WASHINGTON (AP) -- The government is teetering on the brink of a partial shutdown and congressional Republicans are vowing to keep using an otherwise routine federal funding bill to try to attack the president's health care law.

Congress was closed for the day Sunday after a post-midnight vote in the GOP-run House to delay by a year key parts of the new health care law and repeal a tax on medical devices, in exchange for avoiding a shutdown.

The Senate is set to convene Monday afternoon, just hours before the shutdown deadline. Majority Leader Harry Reid has already promised that Democrats would kill the House's latest volley.

Since the last government shutdown 17 years ago, temporary funding bills known as continuing resolutions have been noncontroversial, with neither party willing to chance a shutdown to achieve legislative goals it couldn't otherwise win. But with health insurance exchanges set to open on Tuesday, tea-party Republicans are willing to take the risk in their drive to kill the health care law.